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The ZO-1–associated Y-box factor ZONAB regulates epithelial cell proliferation and cell density

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Balda, Maria S., Garrett, Michelle D., Matter, Karl·2003·The Journal of Cell Biology

Abstract

Epithelial tight junctions regulate paracellular permeability, restrict apical/basolateral intramembrane diffusion of lipids, and have been proposed to participate in the control of epithelial cell proliferation and differentiation. Previously, we have identified ZO-1–associated nucleic acid binding proteins (ZONAB), a Y-box transcription factor whose nuclear localization and transcriptional activity is regulated by the tight junction–associated candidate tumor suppressor ZO-1. Now, we found that reduction of ZONAB expression using an antisense approach or by RNA interference strongly reduced proliferation of MDCK cells. Transfection of wild-type or ZONAB-binding fragments of ZO-1 reduced proliferation as well as nuclear ZONAB pools, indicating that promotion of proliferation by ZONAB requires its nuclear accumulation. Overexpression of ZONAB resulted in increased cell density in mature monolayers, and depletion of ZONAB or overexpression of ZO-1 reduced cell density. ZONAB was found to associate with cell division kinase (CDK) 4, and reduction of nuclear ZONAB levels resulted in reduced nuclear CDK4. Thus, our data indicate that tight junctions can regulate epithelial cell proliferation and cell density via a ZONAB/ZO-1–based pathway. Although this regulatory process may also involve regulation of transcription by ZONAB, our data suggest that one mechanism by which ZONAB and ZO-1 influence proliferation is by regulating the nuclear accumulation of CDK4.

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Metadata

Authors
Balda, M. S., Garrett, M. D., & Matter, K.
Venue
The Journal of Cell Biology
Published
2003-02-03
Volume
160
Issue
3
Pages
423-432
ISSN
  • 0021-9525 (ISSN-L)
  • 1540-8140
OpenAlex
W2105894053
Cited by
417
References
49
FWCI
11.88
Type
journal article
Language
en
Open access
bronze

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CoChat. (2026). Citation check: The ZO-1–associated Y-box factor ZONAB regulates epithelial cell proliferation and cell density. https://app.cochat.ai/papers/10.1083/jcb.200210020
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Balda, M. S., Garrett, M. D., & Matter, K. (2003). The ZO-1–associated Y-box factor ZONAB regulates epithelial cell proliferation and cell density. The Journal of Cell Biology. https://doi.org/10.1083/jcb.200210020

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